Double-flow fan



Sept. 17, 1929. FALLA 1,728,204

DOUBLE FLOW FAN Filed Nov. 29. 1927 4 Sheets-Sheet Sept. 17, 1929.

DOUBLE FLOW FAN A Filed Npv. 29. 1927 4 Sheefs-She'et 2 F. FALTLA1,728,264

Sept. 17, 1929. FALLA 1,728,204

DOUBLE FLOW FAN Filed Nov. 29. 1927 4 Sheets-Sheet 3 I Sept. 17, 1929.

F. FALLA 1,728,204

DOUBLE FLOW FANv Filed Nov. 29. 1927 4 Sheets-Sheet 4 Patented Sept. 17,1929 PATENT OFFICE FERNANDO FALLA, OF MAPLEWOOD, NEW JERSEY, ASSIGNOR OFONE-HALF TO EDGE HOUR IRON COMPANY, OF EDGE. M003, DELAWARE, ACORPORATION OF DELA- WARE DOUBLE-FLOW FAN Application filed November 29,1927. Serial No. 236,406.

My invention relates to power driven fans and has for its object toprovide in one structure in efiect two fans, each adapted to handle aseparate current of gas and made up of two sets of chutes. crossing eachother in the structure of the fan and having common Walls through whichthe heat of p a heated gas current can be transmitted to a colder gascurrent passing through the other set'of chutes. The nature of myimprovement and the best way which I have devised for the constructionof my improved fan will be best understood as described in connectionwith the drawings which illustrate a fan embodying my invention and inwhich- Figure 1 is a vertical sectional view taken through the center ofthe fan and through its housing; the view is taken as on the sectionline 1"1 of Figure 2.

Figure 2 is a front view of the fan.

Figure 3, a plan view.

Figure 4, a sectional view taken on .the section line 4.-4.-' of Fig. 2,and

Figures 5, 6, 7, and 8, are perspective views showing details ofconstruction.

A is the housing of the fan comprising the inlet chambers A and Acommunicating through openings at and a with a fan chamber, havingdelivery chambers A and A, communicating respectively with outletconduits a and a. B, B, are pedestals support-" ing the driving shaft Bto which is attached the hub C of the fan, which hub, as shown, isprovided with projecting ledges C and C extending laterally in oppositedirections. Secured to these ledges are the back plates of the chutes,indicated at D and D The front plates of the fan chutes are made up ofthe plates E and E which, as shown,

and as convenientl constructed, are made up' of tongues of a isk E, thetongues being bent alternately into opposite curves and secured at theirends to rings indicated at E and E. F, F, etc., indicate the side platesof the chutes which are secured to the edges of the front and rearplates, as shown, formin common partitions between the alternate c utes,one side of which-is indicated at G and the other at G", In'

order to increase the heat conductivity of the partitions or of suchpartitions as are common to the two chutes which they separate, I preferto form on the partition plates ribs indicated at 7 which should, ofcourse, be disposed in the flow lines of the gases passing through thechutes so as to offer as little frictional resistance as possible to theflow of the gases.

It will be obvious that my construction co not only provides in effecttwo independent fans in a single structure but also provides, by reasonof its embodiment of the two sets of fan chutes crossing each other andhaving common partition plates with a very efiicient transfer of heatfrom a current of hot to a current of cold gas. The relative capacity ofthe two sets of chutes should, of course, be made to conform to thevolume of the current of gas passing through them.

Having now described my invention, what I claim as new and desire tosecure by Letters Patent, is:

1. A double flow fan having two sets of impeller chutes, the individualchutes of each set alternating with chutes of the other set, each set ofchutes having entrance and delivery openings on opposite sides of thefan so that alternate chutes of the two sets cross each other laterally,said alternate chutes having common partition walls, said fan havingseparate supply and delivery chambers for each set of chutes.

2. A double flow fan havin the features of claim 1, and having in comination with the common partition walls ribs extending from said wallsinto the chutes disposed to conform with the flow lines through saidchutes.

3. A double flow fan having the features 90 of claim 1, in which thechutes are made up of curved rear plates secured to the hub of the .fanand extending alternately in opposite directions, partition platessecured to the edges of the said rear lates and curved 95 front platessecured to said partition plates.

FERNANDO FALLA.

